I recently hooked up a new Fuji frenic mini VFD to an older 3/4hp motor on my SB Heavy 10. I input all the needed motor parameters and functions into the vfd but I am having a strange recurring issue. The first time I power on the VFD, it works fine. Then when I power it off, sometimes but not always, it will lock up the motor. I go to start the motor again and it sounds like the vfd is trying to get the motor to start but just can't. When this happens, I have to go over and tug on the pulleys to get the motor shaft to move and this slowly unblocks the motor.
Again this doesnt happen every time but still maybe 50% of the time. I thought I would bump the torque boost on the vfd to +20% and it still locks up on 2nd startup. I changed the parameters so it doesn't decelerate the motor so quick (I had it set to 1.5 or 2 seconds acceleration / deceleration).
Any one have any ideas what might be the issue?
Again this doesnt happen every time but still maybe 50% of the time. I thought I would bump the torque boost on the vfd to +20% and it still locks up on 2nd startup. I changed the parameters so it doesn't decelerate the motor so quick (I had it set to 1.5 or 2 seconds acceleration / deceleration).
Any one have any ideas what might be the issue?